Automatic potential-regulator for dynamos



(No Model.) 2 Sheets-Sheet 1.

A.. A. & P. S. TIRRILL. AUTOMATIG POTENTIAL REGULATOR FOR DYNAMOS.

No. 596,923. Patented Jan. 4, 1898.

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(No'ModeL) 2 Sheets-Sheet 2.

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AUTOMATIC POTENTIAL REGULATOR FOR DYNAMOS. N0.;596,923. Patented Jan. 4, 1898.

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UNITED STATES PATENT OEEicE.

ALLEN A. TIRRILL, OF IVIIITEFIELD, AND PI-IILL S. TIE-BILL, OF GROVETON, NEIV HAMPSHIRE.

AUTOMATIC POTENTIAL-REGULATOR FOR DYNAMOS.

SPECIFICATION forming part of Letters Patent No. 596,923, dated January 4, 1898.

Application filed May 1, 1897. Serial No. 634,687. (No model.)

To aZZ whom, it may concern: there is another 011e, c, mounted upon the up- Be it known that we, ALLEN A. TIRRILL, of per end of a screw which is tapped through \Vhitefield, and PHILL S. TIRRILL, of Grovea bracket-shaped metal plate 0 and is fixed ton, in the county of Coos and State of New in its position by a jam-nut c, the two plati- 5 Hampshire, have invented a new and useful num contactlaces being by this means made Improvement in Automatic Potential-Reguadjustable to or from each other. lators for Dynamos, of which the following is The inner ends of the levers B B work toa specification. gether with a loose articulation, and they are The object of our invention is to providea drawn downwardly by a spiral spring D, 1o regulator or governor for a dynamo-electric whose lower end is attached to a tension admachine which shall automatically regulate justing-screw d, held in a metal bracket D the potential or voltage on the supply-wires This screw-stem is grooved longitudinally at so that an even potential shall always be (Z and is locked against turning byj am-nuts d maintained on said wires, notwithstanding cl above and below the bracket-plate D and 15 the varying tax or demand made upon the a screw (1 whose point enters the longitudisupply-wires by the starting and stopping of nal groove d of the screw-stem. electric motors or the throwing in or cutting 1 2 3 4 are binding-posts. Of these, 1 and out of electric lights or other use of the cur- 4: connect, respectively, with the positive and rent. negative wires of the supply circuit and 20 Figure 1 is a front view of our regulator or transmit the current through the coils of the governor, partly in section. Fig. 2 is a back two solenoids by wires 5 6 7. View of a condenser employed in connection The binding-post 2 is by wire 8 connected with our governor. Fig. 3 is a vertical secto the metal lever B and the contact-point a, tion taken through line 8 3 of Fig. 1, and Fig. while the other binding-post 3 is by wire 10 7 5 2 5 4 is a diagram showing the relation of the connected to the metal plate 0 and the other principal parts of our governor to the main contact-point 0. These two binding-posts 2 supply-wires and the shunt-circuit wires of and3are connected, respectively,to the shuntthe dynamo. circuit wires Y Y of the dynamo, or the wires In the drawings, A A represent the hollow which lead a part of the dynamo-current back o coils of two solenoids arranged in vertical pointo the same to regenerate its field-magnets. sition and fixed within a suitable case. In Fig. 4: shows in diagram these connections, the centers of these hollow coils there vibrate where X X represent the supply-wires, that freely the soft-iron cores A A, made, preferextend along the line and connect with the ably,of laminated wire and in double conical opposite poles of the dynamo G and also with 5 form, tapering from the largest diameter in our solenoid-coils A A, while Y Y are the the middle toward both ends. The tops of shuntcircuit wires, which extend to the fieldthese cores are jointed to and suspended from magnets of the dynamo to energize them. the outer ends of delicately-balanced levers These shunt-circuit wires Y Y have a rheo B B, of metal, which are fulcrumed upon statRplacedbetweenthem,butare connected 0 4o pivots within frames Z) and Z1, and at their in with the contact-points a c of our governor, ner ends are lapped for a loose jointed conso that when these contact-points are closed nection. the rheostat is out out and a larger amount The lever B has fixed to it at its inner end of current is sent to the field-magnets of the a metal boss a, carrying a platinum contactdynamo, which increases its power and raises 5 5 face a, which boss is connected to the lever the potential or voltage on the line or supply B by a screw-thread and has a stem a exwires. tending loosely through a hole in the inner The automatic operation of our governor is end of the other lever B and at the upper as follows; If there should be from any cause end is screw-threaded and provided with an a diminution of potential in the supply-wires 50 adjustable milled nut a X X,then the attractiveinfluence of the solen- Just below the platinum contact-point a oid-coils on their cores A will be correspondingly decreased and the spring D, whose tension is adjusted to act at any desired voltage by the adjusting devices below it, pulls down the inner ends of the levers B B and closes contact between the points a c. This (see Fig. 4) cuts out the rheostat R in the shuntcircuit Y Y and, by increasing the amount of current returned to the field-magnets of the dynamo, correspondingly increases its power and brings the potential of the line- Wires up to normal, at which moment the illcreased attraction of the solenoid-coils evercomes the spring D and breaks the shunt-circuit at a 0 again. In this way the making and breaking of contact at the points a and c are so sensitively regulated in an automatic manner as to preserve a practically uniform potential on the supply-wires of the line at all times, regardless of the varying contingencies of use of the current drawn from said wires. To prevent sparking between the points ac, these terminals are connected to the opposite poles of a condenser E. (Shown in Figs. 2 and 3.) This is made in the usual way of alternating layers of tin-foil and insulating-sheets, and one pole, 5c, is connected by wire 11, Fig. 1, to the metal plate 0 and contact 0, while the other pole, y, of said condenser is connected to the other contact a through wire 9, binding-post 2, wire 8, and lever B. This condenser not only prevents the sparking in closing and opening the contact-points a 0, but it also gives a better action for the governor. As an equivalent for such condenser a Leyden jar might as well be used.

Instead of using a spring D to bring the contacts together graduated weights might be used, as shown in dotted lines at it. Instead of using two solenoids and two levers B B only one of each might be used, but we prefer two, as giving a quicker, stronger, and more sensitive action and a better proportioned instrument.

lVe are aware of the British Patent No. 1,535, of 1889, and the United States Patent No. 35et,273, and we make no claim to anything shown therein. Our invention is distinguished by our means for balancing the solenoid-core and adjusting the sensitiveness of the contacts of the field-magnet shunt, which is very necessary to the automatic regulation of the potential.

Having thus described our invention, what we claim as new, and desire to secure by Letters Patent, is

1. An automatic potential-governor for dynamos, consisting of one or more vertical solenoid-coils, arranged in a branch of the main supply-circuit, a vertical core for each solenoid, a lever fulcrumed above and outside of the solenoid and attached to and suspending the core of the solenoid, contact-points arranged as terminals to a shunt from the fieldmagnets of the dynamo, one of said contactpoints being stationary, and the other mounted upon the lever and movable, and a spring and adjusting device attached to the said lever for balancing the solenoid-core and adj usting the sensitiveness of the contacts substantially as and for the purpose described.

' 2. An automatic potential-governor for dynamos, consisting of a case having a vertical partition, one or more solenoid-coils mounted in vertical position 011 one side of said partition and having its wires arranged in a branch of the main supply-circuit, a core for the solenoid, and a lever fulcrumed outside of and above the solenoid and attached to and supporting the core of the solenoid, contact-points arranged as terminals to a shunt from the field-magnets of the dynamo, one of said contact-points being stationary and the other mounted upon the lever and movable, a spring and adjusting devices attached to said lever for balancing the solenoid-core and adjusting the sensitiveness of the contacts, and a condenser arranged vertically on the opposite side of the partition from the solenoid, said condenser having its opposite terminals c011- nected to the opposite contacts of the shunt from the field-magnets substantially as and for the purpose described.

3. An automatic potential-governor for dynamos, consisting of two vertically-arranged solenoids with cores, a pair of levers loosely connected to each other in the middle and to the cores at their outer ends, a spring for pulling down the inner ends of said levers, two contact-points, one carried by the said levers, and the other by an adj Listing-screw, and means for regulating the tension of the spring substantially as and for the purpose described.

at. The combination of the vertical solenoids A and cores A, the horizontal levers B B lapped and loosely connected in the middle and provided with boss a, contact-point a, stem a and nut (i the adjustable screw 0 carrying contact-point c, tension-spring D for the levers, and the tension regulating and locking devices, consisting of the longitudinallygrooved and screw-threaded stem (1, bracket plate D nuts d d and screw (1*, and circuit-wires, all arranged substantially as shown and described. 1

ALLEN A. TIRRILL. PHILL S. TIERILL. lVitnesses:

SOLON G. Knnoiv, EDWD. W. BYRN. 

